Year: 2026
Type: preprint
Abstract: It has been conjectured that the binegativity of two-qubit states is an entanglement monotone. We present a full-rank state as a counterexample: applying amplitude damping to only one of the qubits can increase the binegativity of the state. The output state remains full rank, and the amount of increase can be calculated exactly. In addition, we construct a family of counterexamples that vary continuously with a parameter. In the corresponding one-way local operations and classical communication protocol, the probability-weighted average of the binegativity over the branches after the local measurement is also higher than that of the initial state.
Source: arXiv (Cornell University)
Authors: Zong, Xiao-Lan, Song, Wei, Yang, Ming
Institutions: Hefei Normal University, Anhui University
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G4780458154, G609701848, G8999788578
OpenAlex ID: W7223863846